Chronic Kidney Disease 2005 - Nephrology Kidney Disease 2005.pdf · Pathophysiology • Renal...
Transcript of Chronic Kidney Disease 2005 - Nephrology Kidney Disease 2005.pdf · Pathophysiology • Renal...
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Chronic Kidney Disease
Danny Woo, MD Nephrology Associates of
Kentuckiana 6400 Dutchmans Pkwy, Ste 250
Louisville, KY 40205 502-587-9660
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Nephrosclerosis
• Associated with aging and aggravated by hypertension
• Progression to endstage is 1-2% • African-Americans, higher BP’s,
concomitant renal disease (diabetes) associated with a higher risk of progression
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Nephrosclerosis
• Benign urinary sediment and usually less than 1 gram proteinuria
• Blood pressure control delays progression • ACE inhibitors and ARB’s are important
(diuretics with African-Americans)
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Low Nephron Number
• Low birth weight (less than 5 pounds) is associated with hypertension, diabetes, cardiovascular and kidney disease
• Low birth weight is associated with fewer nephrons and larger glomerular volume
• Compensatory glomerular hypertrophy indicates glomerular hyperfiltration which may hasten glomerular loss
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Diabetic Nephropathy
• Diabetes is the most common cause of ESRD, about 40% of new cases
• 20-30% of all diabetics develop nephropathy • A smaller proportion of type 2 diabetics develop
ESRD than type 1 • Because of the greater prevalence of type 2, half
of diabetic patients with ESRD are type2
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Progression to ESRD
• Progression to nephropathy is similar in type 1 and type 2
• Microalbuminuria develops in about 5 years • Overt proteinuria develops in 5-10 years • ESRD develops 3-5 years after nephrotic
syndrome occurs
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Pathophysiology • Renal lesions are due to accumulation of
extracellular matrix in glomerular and tubular basement membranes resulting in mesangial expansion
• Increased activity TGF-beta, GH, IGF, VEGF. EGF
• Cytokine activation eg renin, angiotensin, endothelin, bradykinin
• Reactive oxygen species ROS • Accumulation of glycation end products • Altered glomerular proteoglycan metabolism • Increased aldose reductase activity and sorbitol • Protein kinase C
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Increased CV Risk With CRF
• About 10% of adults have CRF • CV risk increases with severity of CRF • Most patients with CRF die before reaching ESRD • Associated risk factors include diabetes,
hypertension, smoking, age, hyperlipidemia, anemia, LVH, abnormal calcium and phosphorus, inflammation, oxidative stress, thrombosis, uremic toxins
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CV Disease
• Less aggressive therapy noted in more advanced renal disease
• 40-60% one year mortality in ESRD patients with AMI
• Troponin-T and troponin-I levels are elevated in renal failure with troponin-I more specific for AMI
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Estimation of GFR
• Cockcroft-Gault equation • Modification of Diet in Renal Disease
equation (MDRD)
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Hypertension and Proteinuria
• ACE inhibitors and ARB’s reduce proteinuria and progression to renal failure
• The level of proteinuria correlates with renal disease progression
• Non-dihydropyridine calcium channel blockers reduce proteinuria more than dihydropyridines
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Microalbuminuria
• Normal rate of albumin excretion is less than 20 mg per day
• Persistent excretion of 30 mg to 300 mg indicates microalbuminuria
• Albumin/creatinine greater than 30 mg/gm indicates microalbuminuria
• Microalbuminuria indicates increased risk of cardiovascular death and renal failure
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ACE Inhibitors
• Reduce intraglomerular pressure • Improve the size selective properties of the
glomerular basement membrane
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ACE-I’s and ARB’s
• Reduce proteinuria • Delay progression of renal failure • Combined use reduces proteinuria and
delays renal progression more • Combined use causes more hyperkalemia
and may increase serum creatinine • Combined use reduces mortality in chronic
CHF but not in acute MI
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COOPERATE P
ropo
rtion
reac
hing
end
poin
t (%
)
5
10
15
20
25
30
0 6 12 18 24 30 36 Months after randomization
trandolapril
losartan
combination
Lancet, Dec 17, 2002
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Protein Restriction
• Animal studies show a delay in renal disease progression with dietary protein restriction
• Human studies are inconsistent in showing any benefit especially when there is good blood pressure control
• 0.8 gm/kg – 1.0 gm/kg could be safely instituted without causing malnutrition
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Contrast Nephropathy
• 0.5 mg/dl increase in creatinine or 25% • Due to renal vasoconstriction or tubular
injury due to oxygen free radicals • Most commonly seen in chronic renal
failure (creatinine greater than 1.5), diabetics with renal failure, multiple myeloma, congestive heart failure, hypovolemia
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N-Acetylcysteine (Mucomyst)
• Mucomyst plus hydration reduce the incidence of radiocontrast-induced nephropathy
• 600 mg bid for two days • Acts as an antioxidant and replenishes
depleted glutathione levels
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Intravenous Sodium Bicarbonate
• 154 mEq/L NaHCO3 in D5W-3ml/kg bolus in one hour prior to the procedure with 1 ml/kg/hr for six hours post procedure (volume of D5W reduced to 850 ml)
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Contrast Nephropathy-Prevention
• Avoidance of radiocontrast in high risk patients, or use small doses, or MRI
• Avoidance of volume depletion or NSAID’s • Administer intravenous sodium bicarbonate
and oral N-Acetylcysteine (Mucomyst)
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Atherosclerotic Renal Artery Stenosis
• Prevalence rises with age and presence of vascular disease
• RAS found in 4.3% in 5000 consecutive autopsies, 10.4% in patients with stroke, 14-28% in patients undergoing coronary angiography, 14-42% in patients with vascular disease of the legs or aorta
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Clues to RAS
• Uncontrolled hypertension • Worsened renal function with ACE-I or
ARB • Flash pulmonary edema • Coexistence of vascular disease
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Diagnosis of RAS
• MRA with gadolinium • CT angiography
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Approach to RAS
• Angioplasty and stent, surgery • Medical therapy if there is renal
parenchymal disease (suggested by resistive index greater than 0.8 by doppler ultrasound, increased echogenicity, or creatinine greater than 2.8)
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Renal failure and OTC meds – Dietary Supplements
• Aristolochic acid contained in Aristolochia serpentaria (Snakewood)
• Found as a contaminant in Chinese herbal products
• Causes renal failure with interstitial fibrosis and tubular atrophy
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RF – Dietary Supplements
• Chromium picolinate can raise chromium levels and cause interstitial nephritis, ARF, anemia, hemolysis, thrombocytopenia
• Arsenic, lead, and mercury have been found as contaminants in many preparations
• Tanacetum parthenium (feverfew), Curcuma longa (turmeric), Zingiber officinale (ginger) inhibit cyclooxygenase COX
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RF – Dietary Supplements
• Individual case reports of renal failure have been found with Echinacea, kelp (arsenic), germanium, penny, hydrazine, chaparral, willow bark (salicylate), cat’s claw, yohimbe
• Rhabdomyolysis has been observed with Ma-Huang, wormwood, creatine
• Renal stones have been associated with Ma-Huang, yellow dock, cranberry
• St John’s wort lowers and grapefruit raises some drug levels (cyclosporine, tacrolimus)
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Obesity Related Nephropathy
• Proteinuria is a recognized complication of obesity
• Associated with focal and segmental glomerulosclerosis and glomerulomegaly
• Improved with weight loss • High incidence of renal failure
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Obesity Related Nephropathy
• Caused by hyperfiltration • Associated with leptin • Leptin is a protein hormone produced by
adipocytes that can cause proteinuria, glomerulosclerosis, and synthesis of transforming growth factor beta and collagen
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Obesity Related Nephropathy
• 30 overweight (BMI > 27) diabetic and nondiabetic patients with proteinuria randomized to weight loss diet and control
• Moderate weight loss significantly reduced protein excretion similar to ACE-I and ARB
AJKD 2003:319-327
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Obesity Related Nephropathy
Diet group
Control group
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RENAAL RENAAL Overview • Randomized multi-site, double-blind, placebo-
controlled study to evaluate the renal protective effects of the angiotensin II receptor antagonist losartan in patients with type 2 diabetes and nephropathy
Population • 1,513 patients (31 to 70 years old)
– Diagnosed type 2 diabetes and nephropathy • albumin/creatinine ratio ≥300 mg/g • serum creatinine between 1.3–3.0 mg/dL (1.5–3.0 mg/dL for
men >60 kg)
Brenner BM, et al. N Engl J Med. 2001;345(12):861-869.
www.hypertensiononline.org
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RENAAL
• Cr 2.1-3.6 24.6% reduction ESRD • Cr 1.6-2.0 26.3% • Cr less 1.6 35.3% • Losartan reduced the risk of ESRD with
lower levels of GRF
JASN 2004 Dec;15(12):3117-25
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Conclusion
• CRF is a major public health problem affecting 10% of the adult population
• Most CRF patients die before reaching ESRD
• Significant efforts must be made to identify those at risk so that medical therapy may be begun to reduce renal disease progression and death due to cardiovascular disease